Google Social Search is rolling out, a new service from Google that allows you to easily find material written by people you know and trust. It’s a pretty cool idea, especially in that it’s pretty painless to get started using it. The service will be available through Google Labs Experimental later today. Below, a look at the service.

Let’s first talk about what Social Search is not, to avoid confusion, especially after all the seemingly related news that’s come out recently.

Last Wednesday, Bing announced a deal with Twitter to produce Bing Twitter Search (see Up Close With Bing’s Twitter Search Engine). The new service allows you to search for matching tweets or find interesting links that have been tweeted.

That same day, Google announced that it also had a deal with Twitter to tap into Twitter’s information and make use of it in some way. Potentially, it might produce a Twitter search engine of its own or make a broader real time search engine.

Also that day, Google announced that “Google Social Search” would be coming. This was in development before the Twitter deal was announced and, in fact, doesn’t depend on it at all. Social search doesn’t search against tweets, as I’ll explain.

The first two have privacy concerns, among other issues. The last two especially involved work. You’ve got to actively chose to share results or actively define a set of sites you want to search against. Who wants to do all this?

With Google Social Search, there’s still some work required. But it’s minimal if you already make use of Twitter, Flickr or an existing public social network. Heck, if you use Gmail or Google Reader, you may already be social search ready.

Social Search In Action

Let’s look at how social search actually works in terms of listings, then we’ll spin back to examine what happens under the hood.

Here’s a search I did for Newport Beach:

These results appeared at the bottom of the search page, in their own section, with the heading “Results from people in your social circle for newport beach” as the first arrow highlights. Underneath that are some results from people I’m connected with socially.

The second result is from Thomas Hawk. The second arrow highlights why Google is showing this. It sees that Thomas and I are connected through Flickr, that we’re mutual contacts there.

The second results also highlights something Google touts about social search. You won’t always get these results showing up, but when you do, Google feels they’ll be pretty interesting to you.

In this case, it was. I had no idea that Thomas had such a nice collection of Newport Beach photos.

Drilling Into Social Search

You’re not limited to what shows in your main results. For example, in a search on JetBlue, I get this:

If I click on that top “Results from” link, that the arrow points at, I get to see a full list of social search results like this:

Notice how the first arrow points to “Social” in the Google Search Options area. This tells you that “social” results are showing, versus video results, blog results, news results or other times that search options can show (see Up Close With Google Search Options for more about the entire search options area and how it works).

The second arrow shows that the social results come from “all people” of those within your social circle deemed to have relevant content on the topic. You can click on a name and drill down further, if you like. For example:

That drilldown shows me content from Eric Goldman related to “jetblue,” and the arrow tells me I’m connected to him through Gmail.

This drilldown shows content from David Wallace and that I’m connected to him through Digg.

In the first two examples, both people had one post they’d written that that was relevant to JetBlue. But in this case:

You see that 10e20 has two posts (and that I’m connected with them via Twitter).

Note that sometimes results from people will show, but you won’t see their name mentioned. For example:

See the boxed result? There’s no corresponding person for that listing. This is because it’s a match drawn out of my Google Reader account (see how it says “Reader Subscription) in the listing?).

Also notice that people are listed on the left roughly in the same order as their actual posts are shown. That’s supposed to be how it works, but there are bugs that sometimes mess this up. That’s why “David Berkowitz” is listed second in the people column but his actual post in the results doesn’t appear until the bottom of the page. Google told me they’re working on this.

Finally, the people you see listed for one query will change if you do another. That’s because the people shown depends on which pages Google decides are relevant for a specific query, which raises the issue of how things are ranked.

Ranking, Sorting & Directly Using Social Search

So what comes first in social search? Google says its using its normal ranking algorithm to pick content, so factors such as the number of people linking to a page, the quality of links to that page, the content of the page itself and so on all can have a factor.

Down the line, presumably Google could do more, such as look at the links only between pages authored by those in your social network or by trying to assign an authority score to those you know, based on how closely you seem to be associated with them. But that’s not happening now.

By the way, want to use Google Social Search without hoping it just happens to show up at the bottom of your regular results? After you do any search, use the “Show Options” box just under the search box at the top of the search results page. Then select the “Social” link along the left-side of the page. Now you’ve got social search results.

Your Google Social Circle

One thing I love about the new service is how it makes use of the “social circle” term rather than “social graph,” a phrase more popular in 2007 and 2008 but which doesn’t really explain much to people. Social circle makes sense — these are people you are connected with. They’re in your “circle” of friends.

But how does Google know what your social circle is, in order to produce the social search results? Three methods, the company told me, when I talked with Google about the service:

Google Reader is pretty easy to understand. If you subscribe to blogs using Google Reader, Google figures you like or trust content from those blogs, so they effectively become part of your social circle.

Google Chat is harder to get your head around. If you have a Gmail account, you have a “Chat” section on the left-hand side of your screen. Anyone you’ve enabled chat for is considered a trusted contact by Google, so they become part of your social circle.

But wait, there’s more! Gmail also has a contacts area on the left-hand side of the page, where you can classify people as friends, family or coworkers. Putting someone into one of these categories makes them part of your social circle, as well.

But wait, there’s … confusion. Above, I showed an example of how Eric Goldman is part of my social circle through Gmail. The problem is, he’s not one of my chat contacts. I’ve not tagged him in contacts into the friends, family or coworkers categories. He IS a Gmail contact, so in his particular case, that seems to be enough to put him in my social circle.

Also keep in mind that if you use a Google Apps account (as I do) for email, chances are, social search won’t tap into your email contacts. That’s because to use social search, you need to be logged in using a Google Account. That Google Account will have a contact list that is separate from your Google Apps contacts.

Finally, Google Profiles are used to form your circle. Our Hoping To Improve People Search, Google Launches “Profile Results” article explains how Google Profiles work in more depth. The short story is that if you list a social network you belong to on your profile, Google can use that to effectively import those people into your social circle.

For example, on my Google Profile, I list things like my Twitter account, my Flickr account and my Digg account. Google can then look at these accounts and know who my contacts there are. That’s why in the examples above, you can see Google reporting that I was connected to someone through Digg or Twitter and so on.

Your Social Circle & Knowing Their Content

Knowing your social circle is one thing. Knowing what they’ve written is another. The magic behind the scenes all comes down to links. Here’s an example scenario:

Google sees I have a friend on Twitter

That friend links to their blog from their Twitter profile

Google understands that they are connected to that blog

The friend’s blog has a link to their Flickr account

Google may understand, then, that the person I know on Twitter is also related to their Flickr account, even if that account wasn’t listed on their Twitter profile

One of the nice things with social search is that the privacy issues seem minor. No one but you will see your “friend” results, because those results are expressly tailored to your network.

More important, there’s no personal information from your friends being shared. Social search is simply based on figuring how who your friends are and what content they produce, all of which is already in public.

Things that aren’t in public don’t show in social search. Right now, Google has no way of discovering who your Facebook friends are or content on Facebook that you’ve authored, if you’ve not somehow made that public.

Of course, in order to use the service at all, you have to be logged in. Our Google Search History Expands, Becomes Web History article gets into some of the issues here, although you don’t have to use the web history service itself to use social search.

More Behind The Scenes

To understand more about how social search works, there’s a movie. Two. From Google. The first covers how social search works from a user’s perspective and the second, how things operate behind the scenes:

Wishes

The service is experimental right now, so expect bugs, if you use it. One of the biggest issues I have with it is that you can’t see everyone Google has decided is part of your social circle. I wanted a social circle page to show me everyone. What if I want to remove someone? Or add someone? That’s something Google told me they’re considering for the future.

I also found odd things, such as when I did a search on “SEO,” I didn’t get matches from Matt Cutts, even though I know he’s part of my social network and writes much on that topic. A search on FriendFeed didn’t bring up Robert Scoble, who I’m connected to and who has written extensively on the topic. A feature allowing you to pick a particular person and search just for content from them would be pretty nice.

Also, often images of people or logos don’t show alongside their listings. Google’s aware of this, I was told, and it’s another bug they’re working on.

Overall, though, I’m pretty excited about the new feature. It’s one of those few things that when I saw it back in September, I immediately thought, “Wow — that’s something I’ll use.”

In addition, in a time when people have been showing more interest in ways to get back answers from trusted people they know (see The Rise Of Help Engines: Twitter & Aardvark), Google’s offering an interesting new solution to the problem.